Magnetic phase transitions and ferromagnetic short-range correlations in single-crystal Tb5Si2.2Ge1.8

TitleMagnetic phase transitions and ferromagnetic short-range correlations in single-crystal Tb5Si2.2Ge1.8
Publication TypeJournal Article
Year of Publication2008
AuthorsZou M, Pecharsky VK, Gschneidner KA, Schlagel DL, Lograsso TA
Journal TitlePhysical Review B
Volume78
Pages014435
Date PublishedJul
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000258190000094
Keywordsgd-5(sixge1-x)(4)
Abstract

Magnetic phase transitions in a Tb5Si2.2Ge1.8 single crystal have been studied as a function of temperature and magnetic field. Magnetic-field dependencies of the critical temperatures are highly anisotropic for both the main magnetic ordering process occurring around 120 K and a spin reorientation transition at similar to 70 K. Magnetic-field-induced phase transitions occur with the magnetic field applied isothermally along the a and b axes (but not along the c axis) between 1.8 and 70 K in fields below 70 kOe. Strong anisotropic thermal irreversibility is observed in the Griffiths phase regime between 120 and 200 K with applied fields ranging from 10 to 1000 Oe. Our data (1) show that the magnetic and structural phase transitions around 120 K are narrowly decoupled; (2) uncover the anisotropy of ferromagnetic short-range order in the Griffiths phase; and (3) reveal some unusual magnetic domain effects in the long-range ordered state of the Tb5Si2.2Ge1.8 compound. The temperature-magnetic field phase diagrams with field applied along the three major crystallographic directions have been constructed.

DOI10.1103/PhysRevB.78.014435
Alternate JournalPhys. Rev. B